Valve device



A. PFAU.

VALVE DEVICE.

APPLICMION FILED MAR. 2 4. 1916.

Patented Feb. 24,1920.

55mm/VM this arrangement thefvalves when open will offer the least obstruction to the flow of fluid past the valves, the amount of obstruction being substantially equal to that produced by a single butterfly valve of ordinary construction when fully opened.

With the valves 6, 7, open as disclosed in Fig. 2, the drain valve 14 should be closed and all of the fluid passing the valves will flow from the pipe line 1 to the turbine 3. If it is desired to cut off the flow of fluid to the turbine 3, the valve 6 should first be closed and the drain valves 14 and 15 should be opened, permitting any water on the turbine side of the valve 6 to flow f through the Vdrain 11 into the tail-race 5.

The valve 7should then be closed in order to prevent the flow of fluid which may leak past the valve 6 into the turbine casing.

Any such leakage will flow to the lower portion of the pipe line section 2 and will be discharged through the passage l0, pipe l2, and drain 11, directly to the tailrace. I-n this manner the flow of any fluid to vthe turbine casing maybe effectively prevented even if the valve 6 is not seated perfectly tight. f

It has heretofore been proposed to pre# vent the flow of leakage water to the portion of the pipe line beyond a butterfly valve by manually inserting a dam structure in the pipe line beyond the drain passagel 10 after: the butterfly 'valve 6l has been closed. An

objection to the use of such a structure, is that the dam lstructure must be manually inserted, upon closure of the main butterfly valveyby entering the pipe ythrough a manhole. Another objection to the use of such a structure is, that if a high fluid pressure Y prevails in the main pipe line 1, the velocity of the liquid leakingpast the main butter.-

,fly valve will be suflieently great to carry some of the leakage beyond the dam structure. With the device of the present invention the flow of leakage water to the turbine casing is readily cut od vby manipulating devices which are operable Vfrom the exterior-of the pipe line, thereby eliminating necessity of entering the interior of the conduit. The device of the present invention permits the use of butterflyvalves to effectively prevent leakage of fluid past the valve section irrespective of the fluid pressure,

thereby reducing the cost of construction` and maintenance to a minimum andsecuring all advantages attainable by the use of the more expensive Agate or other types of` valves. t

By arranging the valves 6, 7 closely vadjacent each other and causing them to overlap and engage each other when open, least possible obstruction to the flow of fluid past the valves, is produced. If the valves were spaced apart a considerable distance and not permitted to overlap, there would be an undesirable double 'obstruction produced,

which with the present arrangement is reduced to a single one.

l It should be understood that it is not desired to be limited to the exact details ofco'n Y of disconnected butterfly valvesI for cutting oft' communication through Said pipe line,vv

said valves when closed being spaced apart and -when openV having loverlapping pore tions. Y

3. In combination, a pipe line, and a'pairrof butterfly valves in said 'pipe line, said valves whengopen having overlapping portions and the maximum total `cross sectional area'of both of said valves at said overlapping portions andina plane at right angles to the aXis of saidlpipe line being no greater than the maximum transverse'oross sectional area of either'- of ysaid valves.

4. In combinatioma pipe line, and ai pair of independently operable overlapping 'butterfly valves each adapted to cut. communication through said pipe line. Y

5.l :ln-combination, Va pipe line, a pair of independently operable overlapping butterfly valves in each adapted to ycut off comvmunica'tion throughl saidY pipe line,l said valves when closedv having a coniinedspace between them, and .means for draining said space. Y

6. In combination, a pipe line, alpair lof.

independently operable valvesv in said .pipeV line, said valves when'closed having a con-y fined space between them, means for conducting fluid from said space away `from saidpipe line, and `a yvalve for controlling the flow of fluid ,through saidrrconductingl means. p t

In testimony, whereof, .the signature of the inventor is aflixed hereto. Y

Y,A,RNOLDrFAU.' f`

It is hereby certified that in Letters Patent No. 1,332,000, granted February 24, 1920, upon the application of Arnold Pfau, of Milwaukee, Wisconsin, for an improvement in Valve Devices, an error appears in the printed specification requiring correction as follows: Page 2, line 110, claim 5, strike out the Word in;

and that the said Letters Patent should be read with this correction therein that the sanne maf conform to the record of the case in the Patent Office.

Signed and sealed this 30th day of March, A. D., 1920.

[SEAL] M. H. COULSTON,

Acting Commissioner of Patents. O1. 251-11. 

